<p>
    Encapsulate the usage of other auth.* drivers, to allow multiple sources of users. It can work either in Master/Slave mode (master is read-only, slave is read-write for shared users),
    or in "User-choice" mode where users can choose at login time wich method to use for authentication.
</p>
<p>
    <b>Master/Slave Mode</b>: this is useful to connect Pydio to an external user directory that is not writeable. Typical example would be an LDAP / AD directory.
    To still be able to share resources with external users, setting a "local" sql-based driver as Slave will allow pydio to create shared users in the local DB.
</p>
<p>
    <b>Users'choice</b>: configure two authentication drivers and let your user choose which method to use at login time. This can for example let user declare themselves
    as internal or external.
</p>